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The kidneys remove excess levels of the substance, which casts some doubt on whether creatine supplements are of any value to someone who already has a high muscle creatine content.

Walking

If your body uses up its glycogen supply and you keep exercising, your body will burn fat for energy, decreasing exercise intensity. What you eat several days before endurance activities affects performance. Your food the morning of a sports competition can ward off hunger, keep blood sugar levels adequate and aid hydration.

Sports Medicine

Everyone should drink at least two quarts (eight cups) of water each day, and athletes need more. Drink plenty of fluids before, during and after sports events to stay hydrated and avoid overheating. When you workout or compete, especially in hot weather, try to closely match the amount of fluid you drink with the amount you lose to sweat.

Next thing they know, they have torn a calf muscle or sprained an ankle and they're visiting a therapist like Gelfand, supervisor of the Nicholas Institute for Sports Medicine and Athletic Trauma at Lenox Hill Hospital in New York City.